Volume rendering

* Fixed an old problem where if both the camera and a solid surface were 
inside a volume, the volume wouldn't attenuate in front of the surface (was 
visible in the blender conference art festival clouds animation:

http://mke3.net/blender/devel/rendering/volumetrics/vol_shade_cam_inside.mov

* Initial support for refracting solids inside volumes. I might be able to 
make this work better, but not sure at the moment. It's a bit dodgy, 
limited by the code that does the recursive ray shading - it's really not 
set up for this kind of thing and could use a refactor very much.

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